I'm typing this on my new base MBA and amy trying to decide whether I all that impressed or not. Let me give you some background. I have the original MBA and put in a super 128GB SSD. The overall experience is quite quick and it seems more responsive that my late 2009 MacMini. I do mostly office stuff, surf, iTunes to my A/V system, remote into work and some initial Lightroom processing. On to the new machine.. it's a little more responsive but not definitely night and day. Almost disappointed given I'm comparing it to an original MBA. What I like - - the fans don't nearly go on as much - the extra screen real estate is nice but not noticeably different - 2 USB ports & SD card reader (definitely better than the flip down port) - love the new form factor - photos render faster, especially when using HDR software What I don't like - - what happened to IR?? I listen to headphones a lot with an external USB/DAC Headphone amplifier, lie back and skip/repeat songs with my Apple remote.. no more - miss the power on light on the original MBA - not sure I like the new track pad.. miss the buttons but it seems to work the same way as with the physical click buttons So, I have a couple of weeks to decide. I know that the 2011 MBA is dearly loved around here. I just don't see the night and day difference that I was expecting given over 4 generations of changes..